Method of increasing performance and comfort of a tyre for vehicle wheels and tyre for vehicle wheels

Abstract

Performance and comfort is increased in a tyre for vehicle wheels by assembling a tyre which includes a belt structure including at least one radially external reinforcing layer including a plurality of cords disposed at a substantially zero angle relative to a circumferential extension direction of the tyre. Each of the cords includes cellulose fibres, such as rayon, and aliphatic polyamide fibres, such as nylon.

1 - 29 . (canceled) 
     
     
         30 . A method of increasing performance and comfort in a tyre for a vehicle wheel, comprising:
 assembling a belt structure comprising at least one radially external reinforcing layer comprising a plurality of cords disposed at a substantially zero angle relative to a circumferential extension direction of the tyre,   
       wherein each of said cords comprises cellulose fibres and aliphatic polyamide fibres. 
     
     
         31 . The method as claimed in  claim 30 , wherein at least one cord in a 0° reinforcing layer comprises at least one yarn of aliphatic polyamide fibre and at least one yarn of cellulose fibre twisted together. 
     
     
         32 . The method as claimed in  claim 30 , wherein the radially external reinforcing layer is assembled through winding up of a continuous elongated element comprising at least one continuous hybrid cord, into a plurality of turns. 
     
     
         33 . The method as claimed in  claim 32 , wherein the turns are disposed in axial side by side relationship. 
     
     
         34 . The method as claimed in  claim 32 , wherein the turns partly overlap each other in an axial direction. 
     
     
         35 . The method as claimed in  claim 32 , wherein said continuous elongated element comprises a plurality of continuous parallel hybrid cords disposed in side by side relationship. 
     
     
         36 . The method as claimed in  claim 32 , wherein said continuous elongated element comprises between 5 and 15 continuous parallel hybrid cords disposed in side by side relationship with, or adjacent to other textile cords. 
     
     
         37 . The method as claimed in  claim 30 , wherein a starting modulus evaluated through a load at a specific 1% elongation of the cellulose fibres and the aliphatic polyamide fibres is lower than 20 [cN/tex]. 
     
     
         38 . The method as claimed in  claim 37 , wherein the starting modulus evaluated through the load at a specific 1% elongation of the cellulose fibres and the aliphatic polyamide fibres is lower than or equal to 15 [cN/tex]. 
     
     
         39 . The method as claimed in  claim 30 , wherein a normalised ultimate tensile stress on a count of the cellulose fibres and the aliphatic polyamide fibres is lower than 100 [cN/tex]. 
     
     
         40 . The method as claimed in  claim 39 , wherein the normalised ultimate tensile stress on the count of the cellulose fibres and the aliphatic polyamide fibres is equal to or lower than 90 [cN/tex]. 
     
     
         41 . A tyre for a vehicle wheel, comprising:
 a carcass structure, a belt structure applied at a radially external position to the carcass structure, and a tread band applied at a radially external position to said belt structure,   
       wherein the belt structure comprises at least one radially external reinforcing layer comprising a plurality of cords disposed at a substantially zero angle relative to a circumferential extension direction of the tyre; and 
       wherein each of said cords comprises cellulose fibres and aliphatic polyamide fibres. 
     
     
         42 . The tyre as claimed in  claim 41 , wherein at least one hybrid cord in a 0° reinforcing layer comprises at least one yarn of aliphatic polyamide fibre and at least one yarn of cellulose fibre twisted together. 
     
     
         43 . The tyre as claimed in  claim 42 , wherein each of the cellulose fibre yarns has a count between about 1000 dtex and about 2800 dtex. 
     
     
         44 . The tyre as claimed in  claim 42 , wherein each of the aliphatic polyamide yarns has a count between about 600 dtex and about 2400 dtex. 
     
     
         45 . The tyre as claimed in  claim 41 , wherein each of said hybrid cords has a count between about 1200 dtex and about 7000 dtex. 
     
     
         46 . The tyre as claimed in  claim 42 , wherein twisting imparted to each of the cellulose fibre yarns is between about 150 twists/m and about 600 twists/m. 
     
     
         47 . The tyre as claimed in  claim 42 , wherein twisting imparted to each of the yarns of aliphatic polyamide fibre is between about 50 twists/m and about 300 twists/m. 
     
     
         48 . The tyre as claimed in  claim 42 , wherein twisting imparted to each of the hybrid cords is between about 100 twists/m and about 500 twists/m. 
     
     
         49 . The tyre as claimed in  claim 42 , wherein the yarn of aliphatic polyamide fibre is nylon. 
     
     
         50 . The tyre as claimed in  claim 42 , wherein the cellulose fibre yarn is rayon. 
     
     
         51 . The tyre as claimed in  claim 42 , wherein each of said hybrid cords comprises two nylon yarns and one rayon yarn. 
     
     
         52 . The tyre as claimed in  claim 42 , wherein each of said hybrid cords comprises one nylon yarn and two rayon yarns. 
     
     
         53 . The tyre as claimed in  claim 42 , wherein the hybrid cords of the radially external reinforcing layer have a density between about 50 cords/dm and about 130 cords/dm. 
     
     
         54 . The tyre as claimed in  claim 42 , wherein the aliphatic polyamide is selected from nylon 6, nylon 66, and nylon 46. 
     
     
         55 . The tyre as claimed in  claim 42 , wherein rayon content in the hybrid cord is lower than 80%. 
     
     
         56 . The tyre as claimed in  claim 55 , wherein the rayon content in the hybrid cord is between about 25% and about 75%. 
     
     
         57 . The tyre as claimed in  claim 41 , wherein the belt structure comprises at least one radially internal layer comprising a plurality of reinforcing cords disposed in a crossed orientation relative to the circumferential extension direction of the tyre. 
     
     
         58 . The tyre as claimed in  claim 41 , wherein said tyre is a high performance tyre or an ultra high performance tyre for either a sport utility vehicle or a crossover utility vehicle.